Mark Scheme (Results) January Pearson Edexcel International GCSE. In Biology (4BI0) Paper 2B
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1 Mark Scheme (Results) January 208 Pearson Edexcel International GCSE In Biology (4BI0) Paper 2B
2 Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson, the world s leading learning company. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information, please visit our website at Our website subject pages hold useful resources, support material and live feeds from our subject advisors giving you access to a portal of information. If you have any subject specific questions about this specification that require the help of a subject specialist, you may find our Ask The Expert service helpful. Pearson: helping people progress, everywhere Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wherever they are in the world. We ve been involved in education for over 50 years, and by working across 70 countries, in 00 languages, we have built an international reputation for our commitment to high standards and raising achievement through innovation in education. Find out more about how we can help you and your students at: January 208 Publications Code 4BI0_2B_80_MS All the material in this publication is copyright Pearson Education Ltd 208
3 General Marking Guidance All candidates must receive the same treatment. Examiners must mark the first candidate in exactly the same way as they mark the last. Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can do rather than penalised for omissions. Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie. There is no ceiling on achievement. All marks on the mark scheme should be used appropriately. All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, i.e. if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate s response is not worthy of credit according to the mark scheme. Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification may be limited. When examiners are in doubt regarding the application of the mark scheme to a candidate s response, the team leader must be consulted. Crossed out work should be marked UNLESS the candidate has replaced it with an alternative response.
4 Question number Answer Notes Marks (a) (transfer of pollen) from anther to stigma (by insects); (b). yellow; max (c) 2. nectar;. less surface area / less leaf area / less leaf; 2. (less) chloroplasts / chlorophyll; 3. (less) light trapped / absorbed / eq; 4. (less) photosynthesis; max 3 5. (less) energy / ATP / carbohydrate / starch / sugar / glucose / eq; 5. Ignore food (d). feed on /eat / consume / damage / other plants / eq;. Ignore kill max 2 2. affect food chains / food webs; 3. may become a pest / numbers increase as not eaten / they have no predator / eq;
5 (e). mutation; max 3 2. resistant to poison; 2. Ignore immunity 3. reproduce / breed / mate / (produce) offspring; 4. pass on allele / gene / DNA (for resistance); (f). less light (into eye); 2 2. retina / rod cells / cone cells / fovea; (g) 57.2 / 57;; Allow one mark for 2 0. x 520 / 00 x 520 in working (h) hepatic portal vein; (i). temperature / warmth / suitable temperature; 2. water / moisture / rain; 3. oxygen;. Reject heat 2. Reject humidity / fog 3. Reject air List = 0 if one incorrect eg. carbon dioxide and water = 0 moist soil = 0 max
6 (j). grass grows / grass not eaten / other plants grow / other plants not eaten / eq; 2. competition for named abiotic factor; 3. (less) excretion / faeces / manure / urine; Allow converse 2. Ignore nutrients / resources 3. Ignore seed dispersal max 2 Total 8 marks
7 Question number 2 (a) (i) C; Answer Notes Marks (ii) E and F only; A, E and F = 0 E alone = 0 F alone = 0 (b) max 2. thick wall; 2. muscle; 3. elastic; 4. valves; (c) (i) 0.5;; Allow one mark for 40 in working, but not if
8 (ii). blood flow is slow(er); 2 2. more (time for) diffusion / gas exchange / oxygen uptake / carbon dioxide removal; 2. Reject faster diffusion Fast flow means more diffusion = 0 Lots of capillaries so more diffusion = 0 Total 8 marks
9 Question number 3 (fish numbers decrease) Answer Notes Marks max 6. sewage decomposed / decomposers / decomposition / broken down / digested / eq; 2. bacteria / fungi / microorganisms; 3. (less) oxygen / eq; 4. respiration (by bacteria / for fish); (decrease in algae numbers) 5. less light for photosynthesis; (increase in algae numbers) 5. Ignore if caused by algae growth 7. more light for photosynthesis / more carbon dioxide (from bacteria respiration) for photosynthesis; 8. (more) mineral ions / named mineral ion; 9. fewer fish to feed on algae; Total 6 marks
10 Question number Answer Notes Marks 4(a) (i) sulfur dioxide; Allow pollutant / pollution (ii) rate of translocation; (iii). temperature / CO 2 / light / ph; 2. size / mass / age / species / type / young bean plants / one mature and one young leaf / eq;. Reject time / concentration of SO 2 max (b) (i) arrow from mature leaf to stem / arrow from stem to young leaf; Allow one arrow if from mature leaf to young leaf
11 (ii) phloem; (iii) sucrose / amino acid(s) / water / minerals / ions / named mineral; Reject fructose / glucose / oxygen / carbon dioxide / nutrients Starch and sucrose = 0 Glucose and sucrose = 0 (c) (more photosynthesis). (more) product / glucose / carbohydrate / sugar made; 2. (more) sucrose; 3. (more) translocation / transport; 4. (more) respiration 5. (more) active transport; Allow converse Ignore references to concentration gradient max 3
12 (d) max 4. (dissolves) in water in clouds; 2. sulfuric acid / sulfurous acid; 3. acid(ic) rain; 4. lowers ph; 5. leaching; 6. affects crops / trees / plants / fish / aquatic life / eq; 6. Ignore destroys habitats / harms animals / leads to extinction / affects food chains / less photosynthesis / loss of species / death of organisms Total 3 marks
13 Question number Answer Notes Marks 5 (a) (i). pasteurisation / heat milk to 80 to 90 o C / boil milk; 2. kill bacteria / microorganisms; 3. cool / reduce temperature; 4. (add) Lactobacillus / Streptococcus; 5. leave for stated time between 3 to 2 hours; 6. at 30 to 45 o C / optimum temperature / warm place;. Ignore sterilise / high temperature 2. Reject kills lactic acid bacteria Cool not to kill Lactobacillus = 2 max 4 (ii) bones / teeth / prevents rickets; (iii). less risk of heart disease / of blocking arteries / of stroke / having high blood pressure / of high cholesterol; Allow converse max 2. less risk of obesity / being overweight / of weight gain / less heavy / more weight loss; 3. less risk of type 2 diabetes; 2. Ignore less calories / less energy / healthy weight
14 (b) max 2. contains no lactose / lactose no longer in yoghurt / yoghurt is lactose-free;. Lactose has been digested = 2. digested / broken down; 3. respiration / fermentation; 4. lactic acid; (c). no need to add sugar / eq; 2. provide vitamin C which prevents scurvy / helps skin / tissue repair / immunity / stick cells together / connective tissue / gums / eq; 3. provide vitamin A which helps vision / sight / sight in dim light / immune system / disease resistance / skin / eq; 4. provide fibre / roughage / cellulose which prevents constipation / helps peristalsis / movement through gut / eq;. Ignore sweeten / fructose / fewer calories max 2 Total 0 marks
15 Question number Answer Notes Marks 6 (a) (i) contains DNA/gene/allele/genetic material from another species; Gene from another organism = 0 (ii). more (organisms) produced; 2. genetically identical;. Ignore faster production max 2 3. (named characteristic) insulin / heart / human organs / antibodies / drugs / clotting proteins / disease resistance / frost resistance / eq; 4. no need to repeat GM process / eq; (b). incubate at 25 o C / not at 37 o C / not at body temperature / eq;. Ignore right temperature max 2 2. do not open / tape / seal /cover (plates/culture/flask) / eq; 2. Ignore airtight 3. use non-pathogenic strains / eq; 4. mask / gloves / goggles / labcoat / fume cupboard / eq; 5. description of sterile technique; 5. eg. sterilise work surface / flame loop / wipe surface with disinfectant Total 5 marks
16 Pearson Education Limited. Registered company number with its registered office at 80 Strand, London, WC2R 0RL, United Kingdom
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